Don't you love that! There you are trying your best and you just can't seem to get it. You know you shoot better than this, you know your ammo is loaded right, is it a bad day? Did you change your grip? What the heck is it?! Then you finally get to use the excuse (for real) that so many bad shooters try to use everyday. These darn sights!
Not too long ago I was helping a guy out and watching over his shoulder trying to get his groups to tighten up. He was learning well, slowly getting his groups to shrink and I was happy. Then all of a sudden he was all over the paper, I thinking "okay, that probably enough for today. He's getting tired" He finished his magazine, lays the pistol down on the bench and its then I notice......
The Damn rear sight is not even there! Talk about concentrating on grip and trigger finger :-D